Method of manufacturing coiled heating element
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United States of America Patent
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-
Jan 29, 1991
Grant Date -
N/A
app pub date -
Jul 25, 1988
filing date -
Jul 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coiled heating element is manufactured by providing a coiled element of bare resistance wire in which the coil pitch is not greater than twice the cross-sectional dimension of the wire. The element is stretched by an amount permitting recovery to its original configuration and an electrically insulating particulate material is applied to the stretched element. The stretched element is then allowed to return towards its original configuration thus trapping particulate material between adjacent coils of the element and the element is heated so as to oxidize the surface of the wire.
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